Lock washers, locking clips and locking plates are simple, stable and reliable fastening elements which engage a keyway in the shaft or key slot in the adapter sleeve. The washer locks the nut in position when one of the washer tabs (tangs) is bent into one of the slots on the nut (fig. 7). Locking clips and locking plates are attached to the nut by bolts (fig. 8 and fig. 9).

A locking clip consists of the clip, a hexagonal head bolt in accordance with EN ISO 4017:2011 and a spring-lock washer (fig. 4). A locking plate consists of the plate, two hexagonal head bolts and a wire (fig. 6).

The nut and the locking device must be ordered separately. The appropriate locking device is listed in the product tables. KM lock nuts can be locked either with the MB lock washer listed in the product tables or with a stronger, MB .. A lock washer (→ product table).